Hello Jan,

You are right. The LED pattern shifted left to right and back repetitively.

Here is the correct pattern for Knight rider.

I will build the hardware later this week. I will also correct the schematic later today.

Regards,

Charles Bannister

/* 	XmasLitsBlink.c http://www.8052.com/forum/read.phtml?id=105529*/
/* 	Subject: open project: christmas lightchain */
// 	Knight rider LED's sequence display
//      compile SDCC.EXE XmasLitsBlink.c
//      PACKIHX.EXE XmasLitsBlink.ihz > XmasLitsBlink.hex                  

	#include <AT89X52.H>

//******************Prototype Declaration's*******************
            void delay(unsigned int del_val);
            void shift(unsigned int n);

//******************Definitions*******************************
	#define CLOCK1 P2_7             	// 89C52 pin 27
    #define DOUT P2_6           		// 89C52 pin 26
		
void main (void)  

{
unsigned char i;              			/* General var */

unsigned int convert[12] = {0x8001,0x4002,0x2004,0x1008,0x0810,0x0420,0x0240,0x0180,0x8001,0x4002,0x2004,0x1008};

  while (1)  {                     		/* Loop forever */

	for (i=0; i<12; ++i){                  // shift LED's outside toward inner
	  shift ( convert [i] );
	  delay(100);				
	}

	for (i=12; i>0; --i){			// shift LED's inner toward inner
	  shift ( convert [i] );
	  delay(100);				
	}
	}

}
//************************************************************
// shift 16-bit data
//************************************************************

void shift(unsigned int n)
{
        char j;
        for(j=0; j<16; j++)
        {
                DOUT = n&0x8000; // send data
				CLOCK1 = 1;
  				CLOCK1 = 0;
                n<<=1;          // shift left one bit
        }
}

//************************************************************
// 	delay function ie delay(Ms). Based on 11.059200 MHz
//************************************************************
 void delay(unsigned int del_val)
 {
	int i,k;
	   for(i=0;i<=del_val;i++)
	   for(k=0;k<=111;k++);
 }
 
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